fix: apps/koa/package.json to reduce vulnerabilities

The following vulnerabilities are fixed with an upgrade:
- https://snyk.io/vuln/SNYK-JS-KOA-10944994

Author: snyk-bot

apps/koa/package.json

@@ -29,7 +29,7 @@
   "dependencies": {
     "axios": "^1.7.7",
     "cross-env": "^7.0.3",
-    "koa": "^2.15.3",
+    "koa": "^3.0.1",
     "koa-body": "^6.0.1",
     "koa-router": "^13.0.1",
     "ofetch": "^1.4.1",